Prokaryotes: Bacteria and Archaea
Prokaryotic organisms were the first living things on earth and still inhabit every environment, no matter how extreme.
Prokaryotes, the First Inhabitants of Earth
Archaea are believed to have evolved from gram-positive bacteria and can occupy more extreme environments.
Extremophiles and Biofilms
Prokaryotes are well adapted to living in all types of conditions, including extreme ones, and prefer to live in colonies called biofilms.